Tool retainer



April 14, 1931- E, J. DOWNING 1,800,377

TOOL RETAINER Y Filed Decv 5]., 1928 2 Sheets-Sheet 1 Pnl 14, 1931- E.J. DowNlNG 1,800,377

Patented Apr. 14, 1931 UNITED sTATEs PATENT OFFICE EDWIN J'. DOWNING, OFDENVER, COLORADO, ASSIGNOR TO GARDNER-DENVER COM- PANY, OF DENVER,COLORADO, A CORPORATION OF DELAWARE Toor; RETAINER Application ledDecember 31, 1928. Serial No. 329,644.

The object .of the present invention is to provide a tool retainer inwhich the tool-engaging member or yoke is more securely held against anytendency to open under the strain of blows delivered to it by the toolthat is retained thereby, the means that yieldingly resists the movementof the yoke. moreover having merely a rectilinear movement asdistinguished :from a swinging or klateral movement.

In the accompanying drawings there is disclosed the preferred embodimentof the invention and therein- Figure 1 is a plan view of the chuck endof is a rock drill with the retainer in place.

^ fio housing.

Figure 2 is a longitudinal sectional view on theline 2-2 of Figure 1.

Figure 3 is a front elevation. Y Figure 4 is a perspective view of thechuck Figure 5 isa perspective view of the retaining yoke. Figure 6 is asectional view on the line 6-6 ofFigure 1.

i The drilllst'ructure, itwill berunderstood,

may be of any desired type Aand includes a chuck end 7 with a chuck 8therein to receive the shank 9 of a drill steel or other tool. Thisshank has the usual enlargement shown in f o the form of a collar 10.Thetool, it will be -v spaced longitudinally disposed ears 13 andacentral elongated portion 14 located between the ears 13 and providedwith a longitudinal slot 15. This slot opens into a longitudinal chamber16 that opens through the front end 1- 5 of the enlargement.

A blow-resisting stirrup of substantially U-shape is mounted on thehousing. It consists of side arms or bars 17 slidable in the ears 13 andhaving annular stop flanges 18 w that limit their rearward movement. Onthe rear end'portions of the side arms are relatively heavy coiledsprings 19 that bear against the rear ends of the ears and againstnuts'20 located on and suitably locked to the rear terminals of the sidearms. The front ends of said side arms are connected by a cross bar 21preferably integral with the side arms. It will be noted by reference toFigures 2 and 3 that the cross bar 21 is located at one side of theshank 9 of the tool and is suiiiciently spaced .therefrom to at alltimes permit the passage of the collar past the same,

so that in itself this stirrup does not inter fere with the introductionand removal of the tool from the chuck.

The retaining member is in the form of a yoke 22 carried by a'rearwardly extending arm 23vthat swings in the slot 15 and has at 1 itsrear end an integral cross pin 24 constitutivot that is located in thechamber T e yoke 22 is adapted to embrace the shank of the tool as shownin Figure 3, but the space within it is insuihcient to permit thepassage of the collar 10. V(lonsequently when in the position shown inFigures 2 and 3 this yoke, while permitting a limited movement of thesteel, is in the path of the collar and therefore prevents thedetachment of the steel from the chuck. The upper portion of the yoke isin the form of a relatively heavy body 25, and said body and yoke properslide ing a 'transversely of and against the rear side of ,the cross bar21 of the stirrup. The front face of said yoke and body are providedwith recessed seats 26 and 27, in which the cross bar 21 is `adapted toengage when the yoke is in its operative and when it is in itsinoperative position. The bearing of the yoke against the cross bar iscured by means of a coiled spring 28 located in the rear end of lthechamber 16 and bearing against a washer 29 that inturn has a recess 30.Its front side constitutes a pivotal bearing for the cross pin 24 of thearm 23 of the yoke. The spring 28, it will be noted is very much lighterthan the springs 19 of the stirrup. The arm 23 preferably has anoutstanding finger piece 31 by means of which the yoke can be readilyswung.

With this construction, it will be noted that the yoke 22 can be swungtransversely of the chuck and tool shank and to and from a position inthe path of the collar of said shank.` l/Vhen moved to either positionthe cross-bar 21 of the stirrupV engages in ene Vof the seats 26-27 yandthus ih o'lds the yokeV in its active or inactive position. By forcingthe yoke transversely the cross bar Qlcan be unseated as the vspring 28will yieldy and permit the rearward movement of the yoke. The stirrups17-21, however', has no lateral movement and consequently when the yokeis in its active position, as shown in Figures 2' be apparent to thoseskilled inthe art Without further description, and it will beVunderstood that various :changes in the size, shape,

proportion and minor details of construction may be resorted to withoutdeparting from the spirit or sacrificing .any 0f ,the ldvltages 'of theinvention; What I claim, is:

1.- The Combination with .echuok for holding a tool having anenlargement, of a. tool retainer comprising a yielding stirrup memv bermountedV on the chuck, and a device having an independent mounting. inthe chuck and movably engaged with the stirrup mem- Y ber therewith7 andmovable to and from a .position in the path of the enlargement ofV .aftool placed in the chuck. Y 2. The combination with a chuck for holdinga tool having an enlargement, ofl a tool l retainer comprising ayielding Stirrup inember mounted on the chuck, and a device pivoted onthe chuck and on an axis transversely thereof, and having a portionYmfnfalole to and from a position between the member andV theVenlargement of a tool placed Y in the chuck in the path of theenlargement.

3,Y rlhe combination with a'chuckfor holding a tool having anenlargement, of a stirrup having spaced portions slidable longitudinallyof the chuck, spring means resisting suchV movement, and a retainingyoke having a mounting` on ythe chuck between the V spaced portions ofthe stirrups and-having a part movable transversely of the stirrup VinVengnigement therewith and to and from aposition in the path of a toolplaced inthe chuck. '4. The coinbination'with a chuckfor holding e toolhaving an enlargement, of a stirrup, having spaced portionsslidablelongitudinejlly the chuck and having e eroe/S .bar in .advancethereof, spring means resisting such movement, and a retaining yokeVpivoted on the chuck between the spaced portions and having a partmovable transversely of the stirrup in engagement with the cross bar.end to and .from apositionin the-path foi a tool placed in the chuck.

5. .The combination with a chuck for Vholding a toolhaving anenlargement, said .chuck having. longitudinal gudewayLsy-.of .a

Vstirri-ip ,comprisingside reds slidable in the guideways andja crossbca-reconnecting the 'side bars and located at the sideand out of thepath of the, enlargement of a tool placed in and removable from thechuck, and a tool embracing yoke `Irioiinterl on the chuck .be-

tween Lthe 'guidewey .and .sllidablyv engaged? with the'oross bar ofthe'stirrup andniovablewith .respect thereto into and out oi the path of theenlargement of .a .tool placed in the chuck.. Y

.6. The combination-With aohuck for hold-V ing e tool'liavng .enenlargement, said chuck having longitudinal-guidewuya Of a stillllpcomprising'side rods slidable in the guide- WHYS endA e cross" barconnecting the Aeide 'bare und. Vlooatedat .the eide. out-'of the pathofthe enlargement of a toolV placed in and re- Vmovable from the. chuok.and a .tool embracing yoke .Slidelbly engaged with Vthe cross 'ber ofthe .Stiirup and movablewith respect thereto into and out o f the path.of the enlarge-v ment of e tool pla-'eedl in .the chuck, .Said v'yokehaving recessed .Seats in which .su-id cross vbar detachably engages tohold the'yoke. v

7. The combination with a chuck for' holding a tool having anenlargement, .of a stirrup Slidablelongitudinally; .of the chuck,.spring means resisting suchmovement, anda tool-V f retaining yokeVmounted. .on the chuck and movable' toand ironie positioninthe pathofthe enlargement of atool inthe chuck, and

having a portion movable behind .and engeged by the'etirrupE Y 8.. lThecombination with a chuck ior hold# ing e tool having en enlargement,seid chuck having longitudinal. guideways., of .Stir'rup`e.omprieing'.Side rodsfslidable in `the guide- Way's and a cross barconnecting the side bars and located at-theiside and out of. the path of`:the enlargement of a tool placed in and-' removable from the chuck,and a tool-retaining yoke mounted on the chuck and movable to andk from.e.` position in the path fof the enlargement of a toolin the chuck andhaving .a portieri movable beliindandengaged by the cross bar.

Lf1.20V

, 9.. The combination With a'chucli for. holdv ing a tool having enenlargement, said. chuck having longitudinal guidevvays', of a stirruplcomprising side rods slidable vin the guide- VWays and a cross barconnecting the side Vbars and located at the side'` and out of. the pathof the enlargement of a4 tool placed inland removable from the chuck,and a tool-embracing yoke having an arm pivoted on the chuck,

said yoke being slidably engaged with and being located behind the crossbar and movable to and from a position in the path of the enlargement ofa tool in the chuck.

10. The combination with a chuck for holding a tool having anenlargement, said chuck having longitudinal guideways, of a stirrupcomprising side rods slidable in the guideways and a cross barconnecting the side bars and located at the side and out of the path ofthe enlargement of a tool placed in and removable from the chuck, atool-embracing yoke having an arm pivotally and slidably mounted on thechuck, said yoke being slidably engaged with and being located behindthe cross bar and movable to and from a position in the path of theenlargement of a tool in the chuck, and a spring acting against the yoketo urge it forwardly.

11. The combination with a tool holding chuck including a housing havinglongitudinal ears and a longitudinal slot between said ears, of astirrup comprising side arms slidable in the ears and a cross barconnecting the front ends of the side arms, springs on the rear ends ofthe side arms and resisting the forward movement of the stirrup, atool-embracing retaining yoke having a rearwardly extending arm slidablyand pivotally mounted in the slot, said yoke having its front faceslidable transversely of and against the rear side of the stirrups crossbar, and a spring bearing against the rear end of the yokes arm toyieldingly urge the yoke against the cross bar.

12. The combination with a tool holding chuck including a housing havinglongitudinal ears and a longitudinal slot between said ears, of astirrup comprising side arms slidable in the ears and a cross barconnecting the front ends of the side arms, springs on the rear ends ofthe side arms and resisting the forward movement of the stirrup, atool-embracing retaining yoke having a rearwardly extending arm slidablyand pivotally mounted in the slot, said yoke having its front faceslidable transversely of and against the rear side of the stirrups crossbar, a spring bearing against the rear end of the yokes arm toyieldingly urge the yoke against the cross bar, said spring being weakerthan the springs on the side arms of the stirrup, and seats in the frontside of the'yoke for receiving the cross bar to hold the yoke againstits movement with respect to said cross bar.

In testimony whereof, I ailix my signature.

EDWIN J. DOWNING.

